Set shift device



June 6, 1950 Filed March 7, 1947 H. VAN DOORNE ETAL SET SHIFT DEVICE 2 Sheets-Sheet 1 INVENTOR5 van Door 7e By W- G: Sanders I ZSM/M June 6, 1950 H. VAN DOORNE ETA-L 2,510,439

SET SHIFT DEVICE Filed March 7, 1947' 2 Sheets-Sheet 2 INVENTORS h. v0.11 Door/1e BY W G SQ'INJ CI S Patented June 6, 1950 SET SHIFT DEVICE Hendrik van Doorne and William Gerard Sanders,

Amsterdam, Netherlands Application March 7, 1947, Serial No. 733,220 In the Netherlands February 13, 1946 The invention relates to an apparatus for moving a ruler, triangle, curve or the lik each time over a predetermined distance which apparatus comprises at least one foot supported on face of the drawing and vertically movable in respect of a slide carrying a fulcrum for an L-shaped lever, one arm of which lever cooperates with the foot and the other arm of which may be operated against the action of a spring by means of an operating member.

With a known embodiment of such a drawingapparatus the slide is movable perpendicularly in respect of the plane of the drawing, while the foot is mounted displaceably in a direction parallel to said plane. 7

Hence the whole construction was very complicated, needing a large number of elements.

The invention improves this known type of drawing apparatus by the feature that the foot is mounted to the slide so as to be vertically movable in respect of the surface of the drawing, said slide being displaceable in a direction parallel to the surface of the drawing.

In this manner the construction is ver much simplified so that only a small number of elements has to be used.

Owing to the fact that the slide is movable in a direction parallel to the plane of the drawing the operating member for the apparatus can be formed by a wall portion of the knob of the apparatus.

The principle according to the invention, also permits of an embodiment constructed in such a way that the distance over which the slide is movable may be adjusted by means of a rotatable ring mounted parallel to the plane of movement ofthe slide, the inner rim of which ring curves helically inwards in a certain sector of the ring.

The slide may consist of a guide block for a pin of the foot, which block is provided with flanges, which below the edges of a groove engage with a horizontal guide plate, a locking washer being provided above the edges of the groove, which washer is kept in place by means of safety springs resting against the guide block, said slide preferably comprising a pointed portion, which cooperates with the inwardly curving part of the adjusting ring.

The invention will now be further explained with the aid of the accompanying drawing in which: i

Fig. 1 is a vertical section through a knob containing a device according to the invention,

Fig. 2 is a plan view of the ring for adjusting the distance between the hatching lines,

the sur-.

Claims. (01. 33-410) Fig. 3 a longitudinal section of another embodiment of the slide, and

' Fig. 4 ha view similar to Fig. 1 showing a mod-- ification.

In the said drawing the reference numeral 1 denotes a knob which may be attached e. g. to

a drawing triangle. i

In this knob there is provided a space 2 in.

which the device according to the invention .is lodged.

An operating member 4 to which there is attached a rod 5 extends through a lateral recess 3 of the knob. This rod cooperates by means-of a stud with the forked end of a lever B which is pivotally mounted at l on a block 8. This block is located on a plate 9 of a slide. Under the plate there is provided an intermediate plate In which is adapted to be shifted in a slot H of the guide plate I2. The two plates 9 and H] are fixed to the lower plate l3. Secured to the knob in any desired way below the slide l2 and spaced therefrom to form a guideway for the plate l3 are blocks 3] and 38. The plates I2 and may be secured byscrews or in any other way to the knob.

- The short lever arm also co-operates by means of a stud and fork connection with the pin I4 which is attached to ribbed footIB. This pin passes through a sleeve [5 which. is attached to the slide.

. The long arm of the lever is supported against a hinge ball I! of a rod 18 which is shiftable in a sleeve IS. The said sleeve and rod are surrounded by a press spring 20, which on oneside is held by a ring 2| and on the other side by a screw head 22 of the sleeve IS.

The screw head 22 may be screwed into and out of a threaded sleeve 23, whereby the tension of the spring 20 may be controlled.

In the same plane as that of the plate 9 there is provided a ring 24 (see also Fig. 2) which is guided by a ring 25 a fourth part of which has been removed.

The ring 24 is rotatable by means of a handle 26 which also serves as a pointer for indicating the width of the distance between the hatching on a scale not represented in the drawing.

The plate 9 has a pointed end 21 which cooperates with a helically shaped portion, or a portion that is gradually curved inward in some other manner, 28 of the ring 24.

By turning the ring 24, the point 21 and, along with the same, the slide 9, ill will be hampered in its return movement.

The device operates as follows:

The draftsman holds the knob in his left hand,

foot will then be pressed into the paper 29. At 5 this moment the rotating motion of lever 1 will be stopped and the said lever will tend to move to the llit '"regard'to the knob I iamderetli'e influence of the pressure exerted onthe mem=' her 4.

As this is impossible, because the foot I6 is" firmly pressed into the surface of the paper therknob I as well as the ruler or triangle 30 attached to the same will be shifted td thie rigljt?until the plate ID has reached the left hand end of the slot II.

If the draftsman releases the operatingai ennw her 4, the lever I will be returned to its original position by the spring and will then carry-*aldng the foot l6. As soon asethe return movement of thez foctwhassb'eemstoppedfltheesli dei is also zre- 0 turned to its initial ipositim' r'byi:.:meanss.:ofritl re springs: During: this'movement thepoint 21 of the plate 9 will contact with the segmentfimii wherebg the width fiof the distance .:between :the hatchingzlmesiwill be determined. H

By the movements described abbve the drawing instruments inbor -onmvhiolfiih knob provided with tl'i'e device aecording td the -inventionuis attached, are successively lifted a small distan'ce ofifithe surface of the drawing and subsequently meved 'over thes predetermined dista nce: in -the direction pfithe arrow dw and thenlowered again ontc -the: surface of the draw-ing; aftr which the hatching lineis drawn: I 'I'liesaidmrovements'are: 35

With the embodirnent hccordirig to- Fi'g; "the slide'econsists ob the :two outer plate's which are located one on each' si'de pr the guide? Finite A athe said gui'de -plate which block is provided witha recess fl for the pin ofithe-"fd'ot;

- 'IHe pI-ates S and- 13 are pressed 'agai nst the plate I 2' by means pp springs=33 in order topm Ifistlie plates- -d and-=13 th'ere is provided an vent any possiblei-play, so that the movement of 1 Fig. 4 oi the drawing represents an embodiment provided with a tension spring 34, which embodiment is very simple and reliable and requires only a very small number of members.

We claim:

1. An apparatus for moving a ruler, triangle, curve or the like a predetermined distance comprising ea slide, afoot supported ton lthe surface of*a'*drawirig'vertically'movable with respect to lohsaid slide and mounted on said slide to be vertically movable with respect to the surface of said-:drawing, an L-shaped lever fulcrumed on said slide, one arm of said lever cooperating with said"fdots a spring' biasing the other arm of said lever anwperating member for operating said othe 'aarmragainst said spring and said slide being displabeablaima direction parallel to the surface of saidldrawing.

2i"Aii'apparatus as setforth in claim 1 wherein said operating member is formed as a side of said apparatus? 7 35*Ahapparat1is asset'fortlrinclaim l iwherein a' -ririg--'-rotatabl3 mounted parallel -"td the :plaineof-=movement bf said slide having a helical inner: periphery cooperable with said slide adjusts the; displacement -of- -'said" *slide.e

4'1 An' appar-atusas-set=fertl'iin claim 1 'wherein a-"pin" isiprovided on said fo*ot--'and said" slideconsis'ts pf a guidie bk'ck' fdr said- -pin, said 'blook 0 havin flanges which below the-edges'of a groove engage" with a- -=horizcntal guidej plate; a'*loc'king washewbeing provided above the 'edges ofthe grooveg -which washer is kept in place by= means of saiety springsresting against the guide blo'eki 5. An apparatus as set forth inclaim- 3 wherein the*slide pomprisesa-"poirrt'ed poi-um;- which cooperats witlf th'e-hlical eripher-y were adj ilst irrg ring. i

' N RIK vm DoORNE-fi W SANBERS? sem n-Mm Number Country Dateis l 652,-244n- VGenmawtygwflmflum.Octn27p1937 

